3126778644 has 24 divisors (see below), whose sum is σ = 7959073248. Its totient is φ = 947508640.

The previous prime is 3126778561. The next prime is 3126778649. The reversal of 3126778644 is 4468776213.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3126778593 and 3126778602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3126778649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11843727 + ... + 11843990.

It is an arithmetic number, because the mean of its divisors is an integer number (331628052).

Almost surely, 2^3126778644 is an apocalyptic number.

It is an amenable number.

3126778644 is an abundant number, since it is smaller than the sum of its proper divisors (4832294604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3126778644 is a wasteful number, since it uses less digits than its factorization.

3126778644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23687735 (or 23687733 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 48.

The square root of 3126778644 is about 55917.6058500362. The cubic root of 3126778644 is about 1462.2861917845.

The spelling of 3126778644 in words is "three billion, one hundred twenty-six million, seven hundred seventy-eight thousand, six hundred forty-four".